How to stop coughing/itchy throat

I honestly dont know what to do I keep constantly coughing I cant even get a simple sentence out without coughing. Sometimes its difficult to breath because I cant get a inhale in so it feels like im choking. My throat is so itchy but i cant get rid of it ive tried hot tea,mucinex,dayquil,allergy medication the whole thing but it wont go away. I will literally try anything.